An immutable backup is a backup copy that cannot be altered or deleted for a defined period, even by administrators under normal conditions. It matters because ransomware and destructive attackers often target backups specifically to prevent recovery.
What is an Immutable Backup?
Immutable backups use technical controls to ensure backup data cannot be changed, encrypted, or removed during a retention window. This helps preserve a trustworthy recovery point even if production systems or admin accounts are compromised.
Why Immutable Backups Matter
They improve resilience against ransomware, insider misuse, and accidental deletion by protecting the recovery copy from routine modification.
Immutable Backup vs. Standard Backup
A standard backup may still be modifiable or deletable by attackers or admins. An immutable backup is intentionally protected against change for a defined period.
Frequently Asked Questions
Why are immutable backups important for ransomware defense?
Because attackers often try to destroy recovery options first, and immutability helps preserve at least one trustworthy restore point.
Do immutable backups replace disaster recovery planning?
No. They strengthen recovery posture, but testing, restoration workflows, and broader recovery planning still matter.
